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Science 24 October 1997:
Vol. 278. no. 5338, pp. 650 - 653
DOI: 10.1126/science.278.5338.650
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Reports
Deformation in the Lower Crust of the San Andreas Fault System in Northern California
Timothy J. Henstock,
Alan Levander,
John
A. Hole
A continuous seismic velocity and reflectivity cross-section of the
San Andreas fault system in northern California shows offsets in the
lower crust and the Mohorovi i Discontinuity near the San
Andreas and Maacama strike-slip faults. These faults may cut through
the crust to the upper mantle in a zone less than 10 kilometers wide.
The northern California continental margin to the eastern edge of the
Coast Ranges is underlain by a high-velocity lowermost crustal layer
that may have been emplaced within 2 million years following the
removal of the Gorda plate slab. The rapid emplacement and structure
within this layer are difficult to reconcile with existing tectonic
models.
T. J. Henstock and A. Levander, Department of Geology and
Geophysics, MS-126, Rice University, Houston, TX 77005-1892, USA.
J. A. Hole, Department of Geological Sciences, Virginia
Polytechnic Institute, Blacksburg, VA 24061-0420, USA.
Read the Full Text
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